Control method for reducing urea crystallization in engine SCR tank

A control method and engine technology, applied to engine components, combustion engines, machines/engines, etc., can solve problems such as high risk of urea crystallization, difficulty in achieving equilibrium, multi-pump gas loss, etc.

Active Publication Date: 2020-05-08
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using the throttle valve to increase the exhaust temperature will result in more pumping losses; and if the engine runs in a low-load working area for a long time, the risk of u...

Method used

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  • Control method for reducing urea crystallization in engine SCR tank
  • Control method for reducing urea crystallization in engine SCR tank
  • Control method for reducing urea crystallization in engine SCR tank

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Embodiment Construction

[0040] The core of the present invention is to provide a control method for reducing urea crystallization in the SCR box of the engine, so as to optimize the pumping loss of the engine operation on the basis of reducing the crystallization in the SCR box.

[0041] In order to enable those skilled in the art to better understand the technical solutions provided by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] Such as figure 1 and figure 2 As shown, the control method for reducing the crystallization of urea in the engine SCR box provided by the embodiment of the present invention, the method specifically includes the steps:

[0043] To obtain the temperature upstream of the SCR box, it should be noted here that the specific method of obtaining can be to set a corresponding temperature sensor 4 on the intake pipeline upstream of the SCR box;

[0044] The c...

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Abstract

The invention discloses a control method for reducing urea crystallization in an engine SCR tank. By calculating crystallization energy factors and controlling opening and closing of a bypass valve based on the crystallization energy factors and SCR upstream temperature by ECU, the demand of bypass high-temperature exhaust gas on demand is realized, when to open the bypass valve can be accuratelyknown, so as to ensure that exhaust gas derived from an exhaust pipe enters directly into gas flow of the SCR upstream bypassing a turbocharger, and thus the exhaust gas temperature entering the SCR tank can satisfy reduction of the urea crystallization in the SCR tank; and at the same time, when to close the bypass valve can be accurately known, the problem of massive engine pump gas loss causedby too long opening time of the bypass valve is avoided, and optimization of the pump gas loss of engine operation is achieved on the basis of satisfying reduction of the crystallization in the SCR tank,.

Description

technical field [0001] The invention relates to the technical field of engine urea crystallization, in particular to a control method for reducing urea crystallization in an engine SCR box. Background technique [0002] The catalytic reduction reaction of the SCR box requires a certain temperature. When the temperature of the SCR box is low, urea cannot be combined with NO X The reaction is complete, and the unconsumed urea forms crystals in the SCR tank, which affects the engine power and emission results, and will block the exhaust pipe in severe cases. [0003] At present, the throttle valve is mainly used to control the intake air volume of the engine to increase the exhaust temperature, thereby increasing the NO X Conversion efficiency. However, using the throttle valve to increase the exhaust temperature will result in more pumping losses; and if the engine runs in a low-load working area for a long time, the risk of urea crystallization will be higher. Therefore, t...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N11/00F01N13/00
CPCF01N3/2006F01N3/2066F01N11/002F01N13/00Y02T10/12Y02T10/40
Inventor 朱莉莉王明明兰亚
Owner WEICHAI POWER CO LTD
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